/*
 * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

package org.box2dflash.collision {
	import org.box2dflash.collision.Features;

	// We use contact ids to facilitate warm starting.
	public class ContactID {
		public function ContactID() {
			features._m_id = this;
		}

		public function set (id:ContactID):void {
			key = id._key;
		}

		public function get copy():ContactID {
			var id:ContactID = new ContactID();
			id.key = key;
			return id;
		}

		public function get key():uint {
			return _key;
		}

		public function set key(value:uint):void {
			_key = value;
			features._referenceEdge = _key & 0x000000ff;
			features._incidentEdge = ((_key & 0x0000ff00) >> 8) & 0x000000ff;
			features._incidentVertex = ((_key & 0x00ff0000) >> 16) & 0x000000ff;
			features._flip = ((_key & 0xff000000) >> 24) & 0x000000ff;
		}

		public var features:Features = new Features();
		public var _key:uint;///< Used to quickly compare contact ids.
	}
}